▪ fern family
      climbing fern family in the order Filicales, which contains two genera (Schizaea and Actinostachys) and about 46 species. The family is considered relatively primitive because of the characteristic large, individually produced spore-bearing structures (sporangia) with a ring of thickened cells (annulus) around the apex; the sporangia are usually borne on special leaflets (pinnae) and lack a covering membrane (indusium). Underground, the ferns' usually highly branched rhizomes either form clumps or are creeping. The family has a long fossil record, with records dating back to the Late Cretaceous Epoch (about 100 to 65 million years ago). The genera are usually found in tropical and subtropical regions. The curly grass fern (Schizaea pusilla, one of about 30 species in the genus Schizaea) is a small plant with leaves of two kinds, grasslike and lobed. In Actinostachys, or the ray ferns (16 species), the blades are reduced to a very narrow strip on either side of the midrib.

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Universalium. 2010.

Look at other dictionaries:

  • Schizaeacĕae — Schizaeacĕae, Pflanzenfamilie aus der Klasse der Filices (Farrnkräuter); Keimkapseln auf der Rückseite der Wedel, sitzend, mit vollständig vertical eingezogenem Rande, der Länge nach aufspringend; Keimkörner pyramidal od. kegelförmig, mit… …   Pierer's Universal-Lexikon

  • Schizaeaceae — ? Schizáceas Clasificación científica …   Wikipedia Español

  • Schizaeaceae — noun small family of mainly tropical ferns • Syn: ↑family Schizaeaceae • Hypernyms: ↑fern family • Member Holonyms: ↑Filicopsida, ↑class Filicopsida, ↑Filicinae, ↑class F …   Useful english dictionary

  • schizaeaceae — schiz·ae·a·ce·ae …   English syllables

  • Семейство схизейные (Schizaeaceae) —         Схизейные травянистые, реже лиановидные папоротники, преимущественно тропические и субтропические. Лишь немногие виды встречаются в умеренных областях Северной Америки и Японии, Чили, Новой Зеландии, Тасмании и Южной Африки. Схизейные,… …   Биологическая энциклопедия

  • family Schizaeaceae — noun small family of mainly tropical ferns • Syn: ↑Schizaeaceae • Hypernyms: ↑fern family • Member Holonyms: ↑Filicopsida, ↑class Filicopsida, ↑Filicinae, ↑class Filicinae …   Useful english dictionary

  • Роды сосудистых споровых — Приложение к статье Сосудистые споровые …   Википедия

  • fern — fernless, adj. fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a… …   Universalium

  • Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… …   Universalium

  • Schizaea — noun type genus of the Schizaeaceae cosmopolitan especially in tropics; small leptosporangiate ferns: curly grass fern • Syn: ↑genus Schizaea • Hypernyms: ↑fern genus • Member Holonyms: ↑Schizaeaceae, ↑family Schizaeaceae …   Useful english dictionary

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